Method and device for adjusting an internal obstruction force setting for a motorized garage door operator

Abstract

An operator and related method for adjusting an internal force setting for a motorized garage door operator is disclosed. The operator checks for the presence of a secondary entrapment safety feature and automatically increases a force threshold setting from a first value to a second value if the secondary entrapment safety feature is detected. If the safety feature is not detected or it is later disconnected, then the operator automatically sets the force threshold to a more sensitive value.

1. A method for adjusting an internal force threshold setting for a motorized garage door operator actuated in response to a door move command, the method comprising:
 establishing a base line force application value applied by a motor to move a door between limit positions; 
 storing in a controller maintained by the garage door operator said base line force application value; 
 periodically checking for connection of any one of a plurality of entrapment safety features to said controller by said controller, said controller setting a force threshold to a default value if none of said entrapment safety features are connected to said controller and increasing said force threshold value a predetermined amount above said default value if at least one of said entrapment safety features are connected to said controller, wherein said periodic checking step is performed regardless of whether the door move command has been received or not; 
 determining by the controller the amount of force applied by the motor during movement of the door; and 
 implementing corrective action by said controller if the amount of force actually applied by the motor is greater or less than said base line force application value and said force threshold value. 
 
     
     
       2. The method according to  claim 1 , further comprising:
 setting said threshold to said default value in said controller if none of said entrapment safety features are connected to said controller. 
 
     
     
       3. The method according to  claim 2 , further comprising:
 selecting said entrapment safety features from a group consisting of photoelectric sensors, contact-type safety edge, a motor speed detector, a motor current detector and a door speed monitor. 
 
     
     
       4. An operator system for controlling the operation of a movable barrier, comprising:
 a motor that applies force to move the barrier between open and closed positions in response to a door move command; 
 at least one force sensor associated with said motor for determining a base line application of force applied by said motor to the barrier; 
 a controller connected to said motor to control operation of said motor and to said at least one force sensor, said controller monitoring the force applied by said motor as detected by said at least one force sensor and allowing only said base line application of force and a threshold value to be applied by said motor to the barrier, said controller initiating corrective action through said motor if said base line application of force and said threshold value is exceeded as detected by said at least one force sensor; 
 said controller periodically checking for the connection of at least one safety device to said controller, wherein the connection is checked regardless of whether said door move command has been received or not, and increasing said threshold value a predetermined amount if at least one said safety device is connected and maintaining said threshold value if none of said safety devices are connected.